Rivalry lists are tough because the best rivalries are almost all over a period of time where both teams were great. Bears/Packers, Eagles/Giants, Chiefs/Raiders, etc have the history but even at their peak, they were neverintense as Steelers/Raiders in the 70's, Cowboys/49ers in the 90's or Steelers/Ravens today even if those don't have the same history or aren't relevant today.

Well, the intensity of rivalries are going to change throughout time. So I think we need to have a historical perspective in mind. I'm guessing this list is accounting for the biggest rivalries in the history of the NFL and when they were at their peak, and ranking them in that fashion.

I base it on long term hatred and current battles. Nothing tops the Bears Packers hatred for each other. The next 3 are about equal with the rest lagging behind. Patriots/Jets isn't as big of a rivalry as Rex Ryan wants it to be.